It was a nightmare unlike anything Pep Guardiola has ever experienced.

Man City's 4-0 thrashing at Everton was the heaviest defeat of the Spaniard's entire career - so perhaps it should come as no surprise that the normally cool, calm and collected manager looked like he was caught in the middle of a bad dream.

Just check out this remarkably intense thousand-yard stare, caught on camera after Guardiola had seen his side go 2-0 down:

(Image: Sky Sports)

That is a man with plenty on his mind.

The question is: what exactly what he thinking about as he gazed off into the distance?

1. The what-ifs

"Come to the Premier League, they said. You'll love it England, they said. You can only go down as a real managerial legend if you do it over here, they said…

"I could be in the middle of a winter break right now. If I was still at Bayern, I could quite literally be on a beach at this very moment."

*SIGH*

(Image: SOLARPIX.COM)

2. Sweet memories

"Leo… Oh, Leo.

"How I miss Leo. What I wouldn't give for a little cuddle with Leo…

(Image: Getty)

3. Disbelief

"I never had to deal with this when I was facing Osasuna. Or Inglostadt. Or Leganes. Or Darmstadt. Or Granada…

(Image: Boris Streubel)

4. Self-doubt

"Maybe - just maybe - it might be time for me to think about coaching tackles…"

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5. Future considerations

"Learning Mandarin can't be THAT difficult. And I DO like Chinese food…"